WO2020057535A1

WO2020057535A1 - Scroll compressor

Info

Publication number: WO2020057535A1
Application number: PCT/CN2019/106376
Authority: WO
Inventors: 张琼宇; 刘轩
Original assignee: 艾默生环境优化技术(苏州)有限公司
Priority date: 2018-09-19
Filing date: 2019-09-18
Publication date: 2020-03-26
Also published as: CN211343341U; CN110925195A

Abstract

A scroll compressor, comprising a first scroll component (62) and a second scroll component (60). A first scroll blade (78) of the first scroll component (62) is engaged with a second scroll blade (66) of the second scroll component (60) to form a series of compression cavities comprising an intake cavity, multiple intermediate cavities, and a discharge cavity. A by-pass path (91) extends to pass through a first end plate (74) of the first scroll component (62). One end of the by-pass path (91) is in communication with an exhaust passage via a by-pass port (90), and the other end of the by-pass path (91) is in communication with the intermediate cavity. The position of the by-pass port (90) deviates from the position in the radial direction where the by-pass path (91) is in communication with the intermediate cavity. The configuration of the by-pass path (91) makes it possible to improve the freedom of design of the variable volume ratio of the scroll compressor.

Description

Scroll compressor

This application claims priority from a Chinese patent application filed with the State Intellectual Property Office of China on September 19, 2018, with application number 201811096406.9, and entitled "Scroll Compressor", the entire contents of which are incorporated herein by reference.

Technical field

The present disclosure relates to the technical field of scroll compressors, and more particularly, to a scroll compressor having a variable volume ratio.

Background technique

This section provides background information related to the present disclosure, which is not necessarily prior art.

A climate control system, such as a heat pump system, a refrigeration system, or an air conditioning system, may include a fluid circuit having an outdoor heat exchanger, an indoor heat exchanger, and disposed between the indoor heat exchanger and the outdoor heat exchanger. An expansion device, and one or more compressors that circulate a working fluid (eg, a refrigerant) between the indoor heat exchanger and the outdoor heat exchanger. Effective and reliable operation of the compressor is desired to ensure that the climate control system in which the compressor is installed can effectively and efficiently provide a cooling effect and / or a heating effect as required. Scroll compressors with variable volume ratio (VVR) are often used in such systems to match the pressure ratio of the compressor to the operating pressure required by the system to avoid over-compression.

It is known that a scroll compressor belongs to a typical positive displacement compressor. The compression mechanism of a scroll compressor usually includes a fixed scroll component and a movable scroll component, and the scroll blades of the fixed scroll component and the movable scroll component cooperate with each other to form a series of compression cavities so that the working fluid (also called Compresses a working fluid, such as a gaseous refrigerant, and the compressed high-pressure gas is discharged to the exhaust passage through the exhaust passage to exhaust the pressure zone.

In order to achieve a variable volume ratio, a bypass passage connecting the intermediate compression cavity and the exhaust passage is provided on the end plate of the fixed scroll component. The bypass passage is provided with a check valve at the outlet communicating with the exhaust passage. (Bypass valve), the pressure in the exhaust channel and the exhaust pressure zone corresponds to the operating pressure of the system. When the required working pressure of the system is low, the pressure in the middle cavity is sufficient to open the check valve, and the medium-pressure gas that has not been fully compressed is discharged to the exhaust pressure zone, and the compressor operates at a low volume ratio. The required working pressure is high, the bypass valve remains closed, and the compressor operates at a high volume ratio.

However, because the area of the exhaust passage is limited, when the outlet of the exhaust passage and the bypass passage and the bypass valve are arranged in a limited space of the exhaust passage, the degree of freedom in designing the bypass passage is very low. Not only limits the adjustment capacity of the design volume ratio, but also limits the design of the bypass valve itself. In addition, the axially extending intermediate pressure gas inlet of the bypass passage needs to communicate with the axially extending intermediate pressure gas outlet, so the installation position of the intermediate pressure gas inlet is also restricted, which also limits the ability to adjust the design volume ratio.

Summary of the Invention

This section provides a general summary of this disclosure, and is not a comprehensive disclosure of its full scope or all of its features.

An object of the present disclosure is to provide a variable volume ratio scroll compressor capable of avoiding loss of system efficiency caused by over-compression.

Another object of the present disclosure is to provide a scroll compressor with a high variable volume ratio design freedom, particularly a wider volume ratio design range, to improve the operating efficiency of a system including the compressor.

According to an aspect of the present disclosure, there is provided a scroll compressor including a first scroll member including a first end plate and a first scroll extending from the first end plate. A rotating blade; a second scroll member, the second scroll member including a second end plate and a second scroll blade extending from the second end plate, the second scroll blade and the first scroll The rotating blades mesh to form a series of compression cavities, which includes a suction cavity, a plurality of intermediate cavities, and a discharge cavity. The first end plate includes a bypass passage extending through the first end plate. One end of the bypass passage is in communication with the exhaust passage via a bypass port and the other end is in communication with the intermediate cavity. The position of the bypass port is deviated in a radial direction from a position where the bypass passage communicates with the intermediate cavity.

In some embodiments, the bypass passage may include a first section and a second section communicating with each other, the first section leading to the intermediate cavity, and the second section leading to the Exhaust channel.

In some embodiments, the bypass passage may further include a laterally extending connecting section connecting the first section and the second section.

In some embodiments, the first end plate may include a first annular wall surrounding a first region on a side opposite to the first scroll blade, the first annular wall defining the exhaust passage. The first end plate may further include a discharge passage extending through the first end plate, one end of the discharge passage communicates with the exhaust passage via a discharge port and the other end communicates with the discharge cavity. The discharge port and the bypass port are both disposed in the first region.

In some embodiments, a bypass valve may be provided at the bypass port, and the bypass valve is a one-way valve.

In some embodiments, the bypass path may include a first set of bypass paths and a second set of bypass paths, the first set of bypass paths include one or more first bypass paths, and the second The group bypass path includes one or more second bypass paths.

In some embodiments, in the first set of bypass paths, the first section is one or more, the second section is one or more, the first section and the The second section can be directly connected by one of said connecting sections. In the second group of bypass paths, the first section is one or more, the second section is one or more, and the first section and the second section can pass through One of said connecting sections is directly connected.

In some embodiments, the first set of bypass paths includes a plurality of first bypass paths, and among the plurality of first bypass paths, the connection section may include a first connection section and a second A connecting section, the first connecting section is in direct communication with part or all of the first section, and the second connecting section is in communication with the remaining first section, the first connecting section, and The second section is directly connected. The second group of bypass passages includes a plurality of second bypass passages. Among the plurality of second bypass passages, the connection section may include a first connection section and a second connection section. The first connection section is in direct communication with part or all of the first section, and the second connection section is in communication with the remaining first section, the first connection section, and the second section Direct connectivity.

In some embodiments, the one or more first bypass paths may include a corresponding one or more of the second sections, and the one or more second bypass paths may include a corresponding one or A plurality of said second sections.

In some embodiments, the one or more first bypass paths may share a second section, and the one or more second bypass paths may share a second section.

In some embodiments, the one or more first bypass paths and the one or more second bypass paths may share one of the second section and one of the bypass ports.

In some embodiments, a discharge valve may be provided at the discharge port and a bypass valve may be provided at the bypass port, and the discharge valve and the bypass valve are check valves.

In some embodiments, the bypass valve may be provided separately from the discharge valve. Alternatively, the bypass valve and the discharge valve may be provided as an integrated valve in which at least one of a valve plate, a valve member, a valve stop, and a biasing member is a common member.

In some embodiments, the first section may be disposed radially outward of the first region away from the second section in a radial direction.

In some embodiments, the connection section may include an effective volume section and an ineffective volume section, and the ineffective volume section extends from an opening position of the connection section to a communication position communicating with other sections. The scroll compressor may further include a plug for eliminating the dead volume section.

In some embodiments, one end face of the plug may include a tool engaging groove for engaging with a tool to insert the plug into the ineffective volume section.

In some embodiments, the connecting section may include internal threads over the entire length of the ineffective volume section, the plug is in the shape of a stud with external threads, and the length of the plug is less than the length of the plug The length of the ineffective volume section can be obtained by screwing the plug into the ineffective volume section and fixing it at a position adjacent to the ineffective volume section. A segment is isolated from the effective volume segment.

In some embodiments, the connecting section may be formed with an internal thread only at an opening position thereof, the plug is in the shape of a stepped column and includes a first cylindrical portion and a diameter slightly smaller than the first cylindrical portion. A second cylindrical portion having an external thread formed on the outer peripheral surface of the first cylindrical portion for engagement with the internal thread, and the length of the second portion is set to be able to fill the ineffective volume section.

In some embodiments, the first end plate may further include a second annular wall on a radially outer side of the first annular wall, and a back pressure chamber is defined between the first annular wall and the second annular wall. And the back pressure chamber communicates with one of the intermediate cavities via a back pressure passage extending through the first end plate, the intermediate cavity communicating with the back pressure passage is different from the bypass passage Connected middle cavity.

In some embodiments, the exhaust passage may communicate with an exhaust pressure region of the scroll compressor via a check valve.

A scroll compressor having a variable volume ratio according to the present disclosure makes it possible to improve the variable volume ratio performance and significantly increase the efficiency of the entire system including the compressor by improving the design of the bypass passage that increases the middle lateral section. At the same time, the scroll compressor according to the present disclosure can increase the design freedom of the size, shape, and position of the bypass passage without increasing the size of the compressor, thereby improving the capacity of adjusting the volume ratio and the bypass valve itself. Design freedom, so that the exhaust strategy of the bypass passage can be more comprehensively designed and can be adapted to the design requirements of various bypass valves. All these will greatly improve the energy efficiency and applicability of the compressor, and have broad application prospects.

BRIEF DESCRIPTION OF THE DRAWINGS

The drawings described herein are for illustration purposes only and are not intended to limit the scope of the present disclosure in any way.

1 is a schematic longitudinal sectional view of an example compressor having a variable volume ratio;

2 is a partially cutaway perspective exploded view showing a fixed scroll component and a bypass valve of the compressor shown in FIG. 1;

3a is a perspective view of a bypass passage according to an embodiment of the present disclosure, and FIG. 3b is a schematic longitudinal sectional view of a fixed scroll member to which the bypass passage shown in FIG. 3a is applied;

4a is a perspective view of a bypass passage according to another embodiment of the present disclosure, and FIG. 4b is a schematic longitudinal sectional view of a fixed scroll member to which the bypass passage shown in FIG. 4a is applied;

5 is a partially cutaway perspective view of the fixed scroll member shown in FIG. 4b;

6 is a cross-sectional view of the fixed scroll member shown in FIG. 4b at the intermediate connection section;

7 is a cross-sectional view of a fixed scroll member at an intermediate connection section according to another embodiment of the present disclosure;

8 is a perspective view of a fixed scroll component of a compression mechanism similar to FIG. 2 according to another embodiment of the present disclosure;

9a is a cross-sectional view of a plug according to an embodiment of the present disclosure, FIG. 9b is a partially cutaway perspective view of a bypass passage in which the plug of FIG. A cross-sectional view of the pathway; and

10a is a cross-sectional view of a plug according to another embodiment of the present disclosure, FIG. 10b is a partially cutaway perspective view of a bypass passage in which a plug of FIG. 10a is installed at a connecting section, and FIG. 10c is a side view shown in FIG. 10b Cross-section view of a via.

detailed description

The following description is merely exemplary in nature and is not intended to limit the present disclosure and its applications or uses. It should be understood that corresponding reference numerals in the drawings always indicate the same or corresponding parts and features. This teaching is suitable for incorporation into many different types of vertical or horizontal scroll compressors, including hermetic machines, open drive machines, and non-hermetic machines. For the purpose of example, the compressor 10 is shown as a low-pressure side fully enclosed vertical scroll compressor, that is, where the motor is cooled by suction in a sealed housing, as shown in the vertical section of FIG. 1 . However, the present teachings are equally suitable for integration in high-pressure side compressors and horizontal compressors.

Example embodiments are provided so that this disclosure will be thorough and fully convey the scope to those skilled in the art. Numerous specific details are set forth, such as examples of specific components, devices, and methods to provide a comprehensive understanding of embodiments of the present disclosure. It will be apparent to those skilled in the art that specific details need not be employed, that example embodiments may be implemented in many different forms, and should not be construed as limiting the scope of the disclosure. In some example embodiments, well-known methods, well-known device structures, and well-known technologies are not described in detail.

When an element or layer is referred to as being "on" or "joining", "connected to" or "coupled to" another element or layer, it can be directly on the other element or layer. On a layer, or directly bonded to, connected to, or coupled to the other element or layer, or intervening elements or layers may be present. In contrast, when an element is referred to as being "directly on" or "directly connected to", "directly connected to," or "directly coupled to" another element or layer, there are no intervening elements or layers present. Floor. Other words used to describe the relationship between elements should be interpreted the same way (eg, "between" versus "directly between", "adjacent to" versus "directly adjacent to," etc.). As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

Although the terms first, second, third, etc. will be used herein to describe different elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms . These terms may be used only to distinguish one element, component, region, layer and / or section from another region, layer and / or section. Terms such as "first," "second," and other numerical terms when used herein do not imply a sequence or sequence unless clearly indicated by context. Thus, a first element, component, region, layer, or section discussed below can be termed a second element, component, region, layer, or section without departing from the teachings of the exemplary embodiments.

Referring to FIG. 1, the compressor 10 may include a housing, a refrigerant discharge joint 14, an intake inlet joint (not shown), a motor assembly, a bearing seat assembly, a compression mechanism, a retaining assembly, a seal assembly, and a valve assembly.

The housing can house the motor assembly, bearing block assembly, and compression mechanism. The housing may include: a longitudinally extending housing 30 having a suction inlet (not shown); an end cover 34 having an exhaust outlet 36; a laterally extending partition 37; and a base 38. The end cover 34 may be fixed to the upper end of the casing 30. The base 38 may be fixed to the lower end of the casing 30. The end cover 34 and the partition plate 37 may generally define an exhaust pressure region, and the partition plate 37, the housing 30, and the base 38 may generally define an intake pressure region. The motor component, the bearing block component and the compression mechanism are arranged in the suction pressure area. The partition 37 includes an orifice 39 that provides communication between the compression mechanism and the exhaust pressure region. The exhaust pressure region may generally form an exhaust muffler of the compressor 10. The refrigerant discharge joint 14 may be attached to the housing at an exhaust outlet 36 in the end cover 34. The suction inlet joint may be attached to the housing 30 at the suction inlet. Although illustrated as including an exhaust pressure region, it should be understood that the present disclosure is not limited to compressors having an exhaust pressure region, but is equally applicable to in-line configurations.

The motor assembly may generally include a stator 44, a rotor 46, and a drive shaft 48. The stator 44 can be press-fitted into the housing 30 and drives the rotor 46 to rotate through electromagnetic interaction with the rotor 46. The rotor 46 can be press-fitted on the drive shaft 48. The drive shaft 48 is rotatably driven by a rotor 46 and is supported by a bearing block assembly. A lubricating oil passage 50 is formed in the driving shaft 48 to supply lubricating oil from an oil pool formed at the base 38 to an upper bearing seat assembly and a compression mechanism to provide lubrication. The drive shaft 48 may include an eccentric crank pin 52 having a flat portion thereon for driving engagement with a compression mechanism. The bearing block assembly may include a lower bearing block 56 and a main bearing block 54 fixed within the housing 30.

The compression mechanism may be driven by a motor assembly, and may generally include a movable scroll member 60 and a fixed scroll member 62. The movable scroll member 60 may include an end plate 64 and a movable scroll blade 66 extending vertically upward from an upper surface of the end plate 64. The fixed scroll member 62 may include an end plate 74 and a fixed scroll blade 78 extending vertically downward from a lower surface of the end plate 74. The fixed scroll blade 78 may be engaged with the movable scroll blade 66, thereby forming a series of compression cavities. The volume of these compression cavities will vary throughout the compression cycle of the compression mechanism, and may include a suction cavity located at the outermost side in the radial direction, several intermediate cavities, and a central discharge cavity.

Referring to FIG. 2, the fixed scroll member 62 may include a first annular wall 80 on the other side of the end plate 74 opposite to the side where the fixed scroll blade 78 is located. The first annular wall 80 surrounds the first region 84 which is substantially circular, and the discharge port 88 and the bypass port 90 may be disposed in the first region. The discharge port 88 may communicate with the discharge cavity via a discharge passage (exhaust port) 89, and the bypass port 90 may communicate with the intermediate cavity via a bypass passage 91. The first annular wall 80 defines an exhaust passage 20 on its radially inner side, and the exhaust passage 20 selectively communicates with the exhaust cavity via the exhaust port 88 and the exhaust passage 89 and communicates with the intermediate cavity via the bypass port 90 and the bypass passage 91. Point connected.

In the embodiment shown in FIG. 2, the bypass port 90 is shown as including three first bypass ports 90 a and three second bypass ports 90 b formed substantially symmetrically with respect to the central discharge port 88 to Ensures that the compressor switches steadily and efficiently between low and high compression ratios. The first bypass port 90a communicates with one intermediate cavity via the first bypass passage 91a, and the second bypass port 90b communicates with another intermediate cavity on the opposite side via the second bypass passage 91b. Each bypass port can Corresponds to a bypass path, see Figure 5.

The fixed scroll member 62 may further be provided with a second annular wall 82 on a radially outer side of the first annular wall 80. A substantially annular second region 86 is enclosed between the first annular wall 80 and the second annular wall 82. The back pressure chamber 93 may be provided in a second region 86 located between the first annular wall 80 and the second annular wall 82 in the radial direction, and the back pressure chamber 93 may be connected to the compression mechanism via a back pressure passage (not shown). One of the intermediate cavities communicates and establishes back pressure in the back pressure chamber 93. Therefore, the fixed scroll member 62 and the movable scroll member 60 are kept against each other during the compression mechanism of the compression mechanism, and the axial flexibility of the scroll member is provided in cooperation with the holding assembly, thereby ensuring the safe and reliable operation of the compressor. .

The retaining assembly may generally include a sleeve 18 and a fastener 16 extending through the fixed scroll member 62. The fastener 16 may be fixed to the main bearing block 54. The fixed scroll member 62 can be fixed relative to the main bearing block 54 by a holding assembly that allows the fixed scroll member 62 to have a limited axial displacement based on the back pressure of the back pressure chamber 93.

A seal assembly (e.g., a floating seal assembly provided in the back pressure chamber 93) is used to sealingly engage the first and second

annular walls

80, 82 and the partition plate 37 to bring the back pressure chamber 93 into a low pressure region and a high pressure of the compressor 10. Zone isolation.

The valve assembly may include a bypass valve 13 for controlling the opening and closing of the bypass port 90, and the bypass valve 13 is a one-way valve. An exploded view of the bypass valve 13 is shown in FIG. 2. As shown in FIG. 2, the bypass valve 13 may include a valve plate 130, a valve member 132, a valve stop 133, and a biasing member 134. The valve plate 130 may be positioned above the bypass port 90 such that the drain port 88 and the bypass port 90 are exposed through an orifice on the valve plate 130. The valve stop 133 may be fixed to the valve plate 130 by a fastener such as a bolt or a pin, and the valve member 132 may be positioned and held axially between the valve stop 133 and the valve plate 130. The valve member 132 is displaceable between open and closed positions. The biasing member 134 may bias the valve plate 130, the valve member 132, and the valve stop 133 toward the end plate 74 of the movable scroll member 62 to hold them together. The biasing member 134 may take a variety of forms including, but not limited to, a coil spring, a crescent-shaped washer spring, or a wave washer spring.

In accordance with the arrangement of the bypass ports 90 on both sides, the valve member 132 may include a U-shaped body 136 that defines an aperture 138. The annular body 136 may be aligned with the first and

second bypass ports

90a, 90b in a radial position, and the orifice 138 may be aligned with the discharge port 88 in a radial position. When in the closed position, the annular body 136 may be sealingly engaged with the top surface of the valve plate 130 to seal the orifices of the valve plate 130 communicating with the first and

second bypass ports

90a, 90b to disconnect the bypass port 90a. , 90b are in communication with the exhaust passage 20. At this time, the exhaust port 88 may communicate with the exhaust passage 20 through a corresponding orifice in the valve plate 130 and an orifice 138 in the valve member 132. When in the open position, the annular body 136 of the valve member 132 may be axially offset upwardly against the valve stop 133, thereby providing communication between the first and

second bypass ports

90a, 90b and the exhaust passage 20. At this time, both the discharge port 88 and the bypass port 90 can discharge the compressed working fluid. The U-shaped configuration of the valve member 132 helps reduce the number of parts, but the present disclosure is not limited thereto, and the bypass valves 13 may be separately provided for sealing the first bypass port 90a and the second bypass port 90b, respectively. It can be understood that different numbers and positions of bypass valves and bypass passages can also be provided to selectively communicate intermediate cavities at different pressures. When the pressure in the corresponding intermediate cavity is greater than the pressure above the bypass valve 13 (the pressure in the exhaust passage 20), the bypass valve 13 can be opened unidirectionally upward. When the pressure above the bypass valve 13 is greater than the pressure in the communicating intermediate cavity, the bypass valve 13 is closed.

The valve assembly may further include a check valve (not shown) provided at the orifice 39 of the partition plate 37 to set the discharge pressure of the exhaust passage 20 and then the discharge port 88 and the bypass port 90 Is the system pressure outside the main valve (ie, the condenser inlet pressure of the system in which the compressor 1 is provided). Therefore, the maximum pressure of the exhaust passage 20 is determined by the system pressure outside the main valve.

When the compressor 10 can provide a larger volume ratio or pressure ratio (that is, a larger discharge pressure), but the system requires a smaller volume ratio or pressure (that is, a lower system pressure), if the compression mechanism completely compresses the working medium And discharged at the discharge port 88, the working fluid will be excessively compressed and then partially expanded, causing a certain loss of efficiency. However, in the case of the bypass passage 91, when the working fluid is compressed halfway, the pressure of the corresponding intermediate cavity at one or more bypass valves 13 may have reached the discharge requirement, that is, the system pressure is reached. The corresponding bypass valve 13 and the main valve can be opened, and the working fluid is discharged in advance without excessive compression. On the other hand, when the volume ratio or pressure ratio that the compressor 10 can provide is relatively small, and the system requires a relatively large volume ratio or pressure ratio, the pressure of the corresponding intermediate cavity may be less than the system pressure, and the bypass cannot be opened. Valve 13. At this time, only the discharge port 88 is opened, and the pressure can build up in the exhaust passage 20 and cause the main valve to open upwards when the system pressure above the main valve is high. In this way, the compression mechanism provides the system with a working medium having a pressure equal to or higher than the pressure of the discharge cavity in an adaptive manner.

As the pressure near the outside compression cavity is lower, to achieve a large variable volume ratio range, the bypass path should be set as far as possible outside. However, considering that the bypass port 90 can only be provided in the first area 84 surrounded by the first annular wall 80 together with the discharge port 88 and the space for the bypass valve 13 needs to be set aside, the bypass port 90 is in the first area The setting range in 84 is greatly restricted, which makes the direct-up and direct-down bypass passages not set on the outside, which results in very limited adjustment capacity of the design volume ratio and design freedom of the bypass valve itself.

For this reason, according to an embodiment of the present disclosure, the bypass passage may be provided to include an upper section and a lower section that are offset from each other in a radial direction, so that the radial position with respect to the bypass port can be less than ± d The radial position where the bypass passage communicates with the compression cavity is adjusted within the range of, where d is the diameter of the bypass passage.

The embodiment is described in detail below with reference to FIGS. 3a and 3b, where FIG. 3a shows a group (for example, three) including side sections of an upper section and a lower section that are offset from each other in a radial direction. A perspective view of the configuration of the through passage 91 ′, FIG. 3 b is a schematic longitudinal sectional view of a fixed scroll member to which the bypass passage shown in FIG. 3 a is applied, and only one of the bypass passages is visible in the sectional view of FIG. 3 b. For the sake of clarity, in Fig. 3a, in addition to the bypass path 91 ', other components are omitted from the figure. The bypass passage 91 'extends perpendicularly to the end plate 74 of the fixed scroll member 62 as a whole. It can be seen from the figure that each of the bypass passages 91 'includes an upper section 95' leading to the exhaust passage 20 and a lower section 97 'leading to the middle cavity. The working fluid flows from the middle cavity into the lower section 97 ′ along the arrow in FIG. 3 a, flows into the upper section 95 ′ through the combination of the lower section 97 ′ and the upper section 95 ′, and finally flows into the exhaust gas through the bypass port 90 Channel 20. The lower section 97 'is biased outward in the radial direction relative to the upper section 95', so that the bypass passage 91 'can communicate with the outer middle compression cavity as far as possible, thereby expanding the volume ratio range of the compressor downward. . However, as mentioned above, this communication position can only be adjusted in the radial direction on the order of only a few millimeters.

The configuration of the bypass path 91 according to another embodiment of the present disclosure is described below with reference to FIGS. 4a-4b, 5 and 6. Similar to FIG. 3a, other components are omitted in FIG. 4a, and only a perspective view of a set of (three) bypass passages 91 in this embodiment is shown, and FIG. 4b is a diagram of the bypass passage 91 shown in FIG. 4a applied A schematic longitudinal sectional view of the fixed scroll member 62. FIG. 5 is a partial cross-sectional perspective view of the fixed scroll member 62 shown in FIG. 4b, and FIG. 6 is a fixed scroll member 62 shown in FIG. 4b at the intermediate connection section 99. Cross-sectional view. As shown in the figure, different from the bypass passage 91 ′ of the previous embodiment, the bypass passage 91 includes an end plate 74 that extends substantially perpendicularly (ie, can be completely perpendicular or slightly inclined) to the fixed scroll member 62 to extend to The upper section 95 of the exhaust passage 20, the lower section 97 extending substantially perpendicular to the end plate 74 leading to the intermediate cavity, and the extension of the upper section 95 and the lower section 97 extending substantially parallel to the plane of the end plate 74 Lateral connection section 99. In the sectional view of FIG. 4b, only the lower section 97 of one of the bypass passages is visible. The working fluid flows from the middle cavity into the lower section 97 along the arrow in FIG. 4 a, flows into the upper section 95 through the intermediate connection section 99, and finally flows into the exhaust passage 20 through the discharge port 88. As a result, the opening position of the lower section 97 is no longer limited by the opening position of the upper section 95, but can be set on the radially outer side of the first region 84 away from the vertical range of the first region 84 as required. And it communicates with the outer cavity of the scroll mechanism with a lower pressure in the middle cavity, so that the variation range of the variable volume ratio of the compressor 10 can be widened downward in a desired manner, and the overall efficiency of the system is improved. In addition, since the size of the intermediate connecting section 99 can be larger than the sizes of the upper section 95 and the lower section 97 and the upper section 95 and the lower section 97 are not connected in a staggered manner but can be completely connected with the connecting section 99, the middle The connection of the connecting section 99 to the upper section 95 and the lower section 97 is smoother and the exhaust is smoother, and this allows the size of the lower section 97 to be increased, thereby further improving the bypass efficiency and the variable volume ratio of the compressor 10 Efficiency and help reduce noise. Furthermore, in addition to greater freedom in designing the opening position of the lower section 97, the opening position of the upper section 95 can also be arbitrarily adjusted in the first region 84, thereby enabling the design of the bypass valve 13 to be More convenient and diverse.

In the embodiment shown in FIG. 4 a, since the three bypass passages 91 are arranged along the profile (curve) of the scroll blades and are all disposed radially outward of the first region 84, the strength of the fixed scroll member 62 is considered The size of the transverse connection section 99 cannot be set too large, so a transverse connection section 99 often cannot meet the design requirements of the opening position of the upper section 95. To this end, two cross-connected connection sections are used. In combination, one of the connecting sections projects into a suitable position within the first region 84 for setting the upper section 95. As shown in FIG. 5, in the case where there are two sets of bypass paths, that is, one set of three first bypass paths 91a and one set of three second bypass paths 91b, four can be opened as needed. The transverse connection sections 99a1, 99a2 and 99b1, 99b2. And, in each group of bypass passages, it may be an orientation of three lower sections or only two of the lower sections defining one connection section, that is, directly communicating with one connection section. Correspondingly, the other connection section may not directly communicate with the lower section or only communicate with one of the lower sections, so the orientation of the other connection section may be adjusted to an appropriate position as needed for setting thereon Upper section. As shown in FIG. 6, in the two connecting sections 99a1 and 99b1 for setting the upper sections 95a and 95b of the two sets of

bypass passages

91a and 91b, one connecting section 99b1 is directly communicated with the middle lower section, A connecting section 99a1 is in direct communication with the lower section on the inside.

It should be noted that the number of the connecting sections is related to the number of bypass passages and the setting position, and more or fewer intermediate connecting sections may be provided as required. For example, when a bypass path is provided on each of the two sides, the orientation of the connecting section can be adjusted as required, so only one connecting section can be provided on each side instead of the two connecting sections that are cross-connected. In contrast, in cases where the number of bypass passages per group exceeds three and are distributed, even more connecting sections may be required to realize these bypass passages. In addition, as described above, since the opening position of the upper section can be arbitrarily adjusted by appropriate setting of the connecting section, it is allowed to exhaust the lower sections of the two sets of bypass passages provided on both sides by means of the connecting section. Guided to one location for discharge, that is, allowing only one upper section and one bypass port to bypass the intermediate cavity on both sides. This arrangement can obviously save the design space of the first area 84.

For example, referring to the embodiment shown in FIG. 7, the number of

bypass passages

91a, 91a, 91b, and 91b on both sides is two, and the two sets of

bypass passages

91a, 91a, 91b, and 91b on both sides share one. The upper section 95 and a bypass port 90, for which two sets of bypass passages are respectively arranged so that the connecting section 99a communicating with both the

lower sections

97a, 97a and the two

lower sections

97b, 97b are communicating The connecting section 99b can be oriented to extend toward the common upper section 95 and communicate to the same upper section 95. Although in the embodiment shown in FIG. 7, the number of bypass passages per group is two and one connection section is adopted, the present disclosure is not limited thereto, and the number of bypass passages per group may be one or more than two And more than one connection section may be used, as long as the connection sections directly communicating with the upper section are arranged to lead to a common upper section.

As shown in FIG. 8, in the case where only one upper section 95 and one bypass port 90 are provided, instead of providing a main valve at the orifice 39 of the partition plate 37, a control port can be provided at the discharge port 88. A one-way discharge valve (HVE) of exhaust pressure, and the discharge valve may be provided separately from a single bypass valve or integrated as shown in FIG. 8. In the embodiment shown in FIG. 8, the functions of the bypass valve and the discharge valve can be realized simultaneously through the specially designed valve 113, which simplifies the structure and further improves the efficiency of the scroll compressor and the system, which not only improves The efficiency in the over-compressed state also improves the efficiency in the under-compressed state. Similar to the bypass valve 13 shown in FIG. 2, the check valve 113 in FIG. 8 also includes a valve plate 130, a valve member 132, a valve stop 133, and a biasing member 134. In accordance with the arrangement of the discharge port 88 and the bypass port 90, the sheet-shaped body of the valve member 132 may include aligned with the discharge port 88 and the bypass port 90 in a radial position and cover the valve plate 130 and the discharge port, respectively. 88 and the two parts of the orifice corresponding to the bypass port 90, the valve member 132 itself does not include the orifice 138 (see FIG. 2).

When in the under-compressed state, both the bypass valve and the discharge valve can be closed, and the scroll compressor continues to compress until the pressure in the discharge cavity is higher than the system pressure above the discharge valve to open the discharge valve; when in the over-compressed state, pass The pressure in the intermediate cavity connected by the bypass passage is higher than the system pressure above the bypass valve. Both the bypass valve and the discharge valve can be opened, and the compressor operates at a low volume ratio.

The one-way valves described above only allow the working fluid to flow out unidirectionally from the compression cavity, which can generally prevent the backflow of compressed gas or prevent the compressor from reversing after shutdown. And these check valves can be any suitable type of check valves, such as valve discs, spring-loaded check valves and the like.

It can be understood that the design concept of the bypass path of the present disclosure is not limited to the configuration of the bypass path shown in the figure, and the bypass path is designed so that the position of the bypass port deviates from the bypass path in the radial direction. All modifications of the location communicating to the intermediate cavity fall within the scope of the present disclosure. For example, instead of a segmented bypass passage that is straight up and down, the bypass passage can be extended obliquely or curvedly compared to the vertical or horizontal direction. Similarly, the bypass passage composed of a plurality of sections in the embodiment shown in the figure may also be configured to include an upper section, a lower section, and / Or connecting sections. Therefore, unless expressly stated otherwise, "longitudinal" or "lateral" herein cannot be interpreted as a vertical or horizontal direction in the strict sense.

In addition, although in the above-mentioned embodiment, the two sets of bypass passages are shown as being disposed substantially symmetrically with respect to the longitudinal axis of the end plate of the fixed scroll member, the present disclosure is not limited thereto and does not affect the compression mechanism In the case of normal operation, two sets of bypass paths can be set accordingly according to whether the design of the compression mechanism is symmetrical, and the configuration and number of the two sets of bypass paths can be different from each other.

It should be noted that, because the connection section is provided inside the solid end plate of the fixed scroll component, due to the limitation of the processing method, the transverse connection section is made by punching from the circumferential side surface of the end plate and extending to the Formed at the ends where the upper sections communicate. This means that the actual length of the intermediate connection section exceeds its required length. Because a longer connecting section is used to connect the lower section and the upper section of the bypass passage, the bypass passage is longer. After the system pressure is increased and the bypass valve is closed, the long bypass path will cause the clearance volume of the scroll component to be too large, which will cause the compressor efficiency to decrease. According to an embodiment of the present disclosure, a specially designed threaded hole is used to cooperate with a plug method to prevent the compression working medium from entering the ineffective volume (that is, the ineffective VVR volume) from the effective volume of the bypass passage (that is, the effective VVR volume section) Section), which can greatly reduce the clearance volume, improve the efficiency of the compression mechanism, and also reduce the impact of the lateral process holes on the strength of the scroll component.

Two embodiments of a bypass passage including a connection section to which a plug is installed according to the present disclosure are described below with reference to FIGS. 9a-9c and FIGS. 10a-10c. 9a is a cross-sectional view of a plug 103 according to an embodiment of the present disclosure, FIG. 9b is a partially cut-away perspective view of the

bypass passages

91a and 91b installed with the plug 103 of FIG. 9a, and FIG. 9c is a view shown in FIG. 9b A cross-sectional view of the

bypass passages

91a and 91b. 10a is a cross-sectional view of a plug 203 according to another embodiment of the present disclosure, FIG. 10b is a partially cut-away perspective view of the

bypass passages

91a and 91b installed with the plug 203 of FIG. 10a, and FIG. Sectional views of the

bypass passages

91a and 91b. Among them, for the sake of clarity, in addition to the bypass path, other components are omitted in the figure.

In the embodiment shown in Figs. 9a to 9c, the plug 103 has a short stud shape, and a tool engaging groove 105 is formed on one end surface of the plug 103, as shown in Fig. 9a. An internal thread is formed on the inner surface of the lateral process hole forming the

connection sections

99a and 99b, and the internal thread extends from the position of the lateral process hole on the circumferential side surface of the end plate to the lateral process hole. At a communication position communicating with the lower section, that is, over the entire longitudinal length of the dead volume of the transverse process hole. After the

bypass passages

91a and 91b have been punched and the ineffective volume is formed as a threaded hole, a tool such as a screwdriver is used to engage the tool engagement groove 105 on the plug 103 and the plug 103 is screwed into the screw hole and fixed The ineffective volume is isolated from the effective volume at a portion where the ineffective volume is adjacent to the effective volume. As a result, the compressed working fluid entering the connection section from the lower section is blocked by the plug 103 and cannot enter the ineffective volume, and can only enter the upper section along the effective connection section (the effective volume of the present disclosure) and be discharged from the bypass port. .

In another embodiment shown in FIG. 10a to FIG. 10c, the plug 203 has a long stepped column shape and includes a first cylindrical portion 206 and a second cylindrical portion 207. The length of the first cylindrical portion 206 is much shorter than that of the second cylindrical portion. The length of the portion 207. As shown in FIG. 10a, the first cylindrical portion 206 is formed in a stud shape with external threads similar to the plug 103 shown in FIG. 9a for engaging an internal thread formed in a lateral process hole, and the first cylindrical portion 206 has a tool engaging groove 205 formed on an end surface opposite to an end surface connecting the second cylindrical portion 207 for engaging a tool such as a screwdriver. The diameter of the second cylindrical portion 207 is slightly smaller than the diameter of the first cylindrical portion 206, and more specifically slightly smaller than the inner diameter of the connecting section. Unlike the first cylindrical portion 206, the outer peripheral surface of the second cylindrical portion 207 is smooth without threads. Accordingly, the lateral process holes for forming the connecting

sections

99a and 99b are formed with internal threads having a length corresponding to the length of the first cylindrical portion 206 only at the positions of the openings on the circumferential side surface of the end plate. When installing the plug 203, first insert the second cylindrical portion 207 into the transverse process hole, and finally screw the first cylindrical portion 206 into the transverse process hole with a tool to engage and fix the internal thread at the opening position. In this embodiment, the length of the second cylindrical portion 207 can be flexibly determined according to the difference between the length of the invalid volume and the length of the first cylindrical portion 206 to minimize the residual clearance volume.

It can be seen that both the former embodiment in which the short plug is matched with the long threaded hole and the latter embodiment in which the short screw hole is matched with the long plug can achieve the purpose of substantially eliminating the clearance volume and thereby improving the efficiency of the compression mechanism. You can choose flexibly according to the situation. In addition, the two embodiments, especially the embodiment using a long plug, are extremely advantageous for increasing the strength of the fixed scroll component.

Although various embodiments and modifications of the present disclosure have been specifically described above, those skilled in the art should understand that the present disclosure is not limited to the above specific embodiments and modifications but may include various other possible combinations and combinations. . Other variations and modifications may be effected by those skilled in the art without departing from the spirit and scope of the disclosure. All of these variations and modifications fall within the scope of the disclosure. Moreover, all components described herein may be replaced by other technically equivalent components.

Claims

A scroll compressor includes:

A first scroll member, the first scroll member including a first end plate and a first scroll blade extending from the first end plate;

A second scroll member including a second end plate and a second scroll blade extending from the second end plate, the second scroll blade being engaged with the first scroll blade A series of compression cavities is formed, which includes a suction cavity, a plurality of intermediate cavities, and a discharge cavity,

among them,

The first end plate includes a bypass passage extending through the first end plate. One end of the bypass passage is in communication with the exhaust passage via a bypass port and the other end is in communication with the intermediate cavity. The position of the bypass port is deviated in a radial direction from a position where the bypass passage communicates with the intermediate cavity.
The scroll compressor of claim 1, wherein the bypass passage includes a first section and a second section communicating with each other, the first section leading to the intermediate cavity, and the first section Two sections lead to the exhaust passage.
The scroll compressor according to claim 2, wherein the bypass passage further includes a laterally extending connecting section connecting the first section and the second section.
The scroll compressor according to claim 3, wherein:

The first end plate includes a first annular wall surrounding a first region on a side opposite to the first scroll blade, the first annular wall defining the exhaust passage,

The first end plate further includes a discharge passage extending through the first end plate, one end of the discharge passage communicates with the exhaust passage via a discharge port and the other end communicates with the discharge cavity, and

The discharge port and the bypass port are both disposed in the first region.
The scroll compressor according to claim 1, wherein a bypass valve is provided at the bypass port, and the bypass valve is a one-way valve.
The scroll compressor of claim 4, wherein the bypass passage includes a first set of bypass passages and a second set of bypass passages, and the first set of bypass passages includes one or more first bypass passages Communication path, the second group of bypass paths includes one or more second bypass paths.
The scroll compressor according to claim 6, wherein:

In the first group of bypass passages, the first section is one or more, the second section is one or more, and the first section and the second section pass through one The connecting sections are directly connected, and

In the second group of bypass passages, the first section is one or more, the second section is one or more, and the first section and the second section pass through one The connecting sections communicate directly.
The scroll compressor according to claim 6, wherein:

The first group of bypass passages includes a plurality of first bypass passages. Among the plurality of first bypass passages, the connection section includes a first connection section and a second connection section. A connection section is in direct communication with some or all of the first section, and the second connection section is directly in communication with the remaining first section, the first connection section, and the second section. Connected and

The second set of bypass passages includes a plurality of second bypass passages. Among the plurality of second bypass passages, the connection section includes a first connection section and a second connection section. A connection section is in direct communication with some or all of the first section, and the second connection section is directly in communication with the remaining first section, the first connection section, and the second section. Connected.
The scroll compressor according to claim 7 or 8, wherein the one or more first bypass passages include a corresponding one or more of the second sections, and the one or more second bypass passages The bypass path includes a corresponding one or more of the second sections.
The scroll compressor according to claim 7 or 8, wherein the one or more first bypass passages share a second section, and the one or more second bypass passages share a second section Section.
The scroll compressor of claim 10, wherein said one or more first bypass passages and said one or more second bypass passages share one said second section and one said bypass Communication port.
The scroll compressor according to claim 11, wherein a discharge valve is provided at the discharge port and a bypass valve is provided at the bypass port, and the discharge valve and the bypass valve are single To the valve.
The scroll compressor according to claim 12, wherein the bypass valve and the discharge valve are separately provided, or the bypass valve and the discharge valve are provided as an integrated valve, in which the integrated valve, At least one of the valve plate, the valve member, the valve stop, and the biasing member is a common member.
The scroll compressor according to any one of claims 1 to 8, wherein the first section is disposed radially outward from the second section in a radial direction away from the second section. .
The scroll compressor according to any one of claims 1 to 8, wherein the connection section includes an effective volume section and an ineffective volume section, and the ineffective volume section is separated from the connection section. The opening position extends to a communication position communicating with other sections, and the scroll compressor further includes a plug for eliminating the ineffective volume section.
The scroll compressor according to claim 15, wherein one end surface of the plug includes a tool engaging groove for engaging with a tool to insert the plug into the dead volume section.
The scroll compressor according to claim 15, wherein the connection section includes an internal thread over the entire length of the dead volume section, the plug is in the shape of a stud with an external thread, and the The length of the plug is smaller than the length of the ineffective volume section, and the plug can be screwed into the ineffective volume section and fixed at a position where the ineffective volume section is adjacent to the effective volume section. The ineffective volume section is isolated from the effective volume section.
The scroll compressor according to claim 15, wherein the connection section is formed with an internal thread only at an opening position thereof, the plug is in the shape of a stepped column and includes a first cylindrical portion and a diameter slightly smaller than A second cylindrical portion of the first cylindrical portion, an external thread for engagement with the internal thread is formed on an outer peripheral surface of the first cylindrical portion, and a length of the second portion is set to be able to fill the void Volume section.
The scroll compressor according to any one of claims 1 to 8, wherein the first end plate further includes a second annular wall on a radially outer side of the first annular wall, and the first annular plate A back pressure chamber is defined between the wall and the second annular wall, and the back pressure chamber communicates with one of the intermediate cavities via a back pressure passage extending through the first end plate, and communicates with the back pressure The intermediate cavity communicating with the passage is different from the intermediate cavity communicating with the bypass passage.
The scroll compressor according to any one of claims 1 to 8, wherein the exhaust passage communicates with an exhaust pressure region of the scroll compressor via a check valve.